Illumination – Revolving
Patent
1998-06-02
2000-07-11
O'Shea, Sandra
Illumination
Revolving
362330, 362339, 362 26, 362 27, F21V 704
Patent
active
060862114
ABSTRACT:
A surface light source device of side light type is provided with a guide plate, a primary light source, a reflection sheet, and a prism sheet providing a light control member. An emission surface of the guide plate provides a light control surface (arrow C). The light control surface has a large number of minute projections each of which extends generally orthogonal or slightly obliquely to an incidence surface. Each projection has a pair of slopes. A surface of a light control member (prism sheet) is opposite with the guide plate to provide another light control surface (arrow D). Projections on the light control member extend generally in parallel with the incidence surface of the guide plate and each have first and second slopes which are relatively remote from and relatively near to the incidence surface, respectively. Inclination angle .beta.2 of the second slope (as defined with respect to a normal erected on a general surface of the guide plate) is small compared with inclination angle .beta.1 of the first slope. Inclination angle .beta.2 may be smaller than, for example, 40-degrees. A light diffusion member may be disposed between the emission surface of the guide plate and the light control member.
REFERENCES:
patent: 5408388 (1995-04-01), Kobayashi et al.
DelGizzi Ronald E.
Enplas Corporation
O'shea Sandra
LandOfFree
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